Q: what causes a P0174 bank2 combustion too lean

asked by on

I have a 2000 ford explorer 4.0 sohc and here lately when driving sumtimes outta nowhere itll just lose speed and the rpms drop,doesnt wanna go anywhere it seems..until i pull over n rurn truck off then on again and its ok for a little bit then will do it again. I took it to autozone to have the codes pulled cause yes my check enginelight is on and they got the code P0174-bank 2 conbcombustion is too lean. I changed the bank 2 oxygen censor and cleaned my MAF censor and it still does it. What else could it be??

My car has 164000 miles.

You will need to have the system inspected thoroughly to see why the vehicle is going lean. The possible causes are that you are loosing fuel pressure or fuel volume. If fuel pressure gets too low it will cause the loss of power and the fuel filter may cause the loss of fuel volume if it is clogged.

The O2 sensor is just letting you know that it detected a lean condition and there are several tests that would need to be done to isolate the problem. You may have an injector on bank two going bad or have a computer going bad.

All of these possibilities would need proper diagnosis to isolate the problem. I’d recommend getting some help from a professional mechanic who can diagnose your Check Engine Light and make the necessary repairs to get your car running normally again.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. what causes a P0174 bank2 combustion too lean

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Check Engine Diagnosis - Transmission controller Communication error codes

Hello there, many different faults can cause this combination of codes on your 2006 Chrysler PT Cruiser. When we see loss of communication codes with Transmission Control Module (TCM) internal faults, this usually means one of the following: ...

Q: P0016 (crankshaft and camshaft correlation bank 1 sensor A)

Hello. Trouble code P0016 is set when the computer detects that there is an issue with the timing between the engine's camshaft and crankshaft signals. The camshaft and crankshafts are connected by a belt or chain, and are precisely timed...

Q: Transmission 2000 Honda Accord

Hello - given your advanced mileage, it is likely the harsh 1st to 2nd shift is a worn out 2nd gear clutch pack . This clutch pack catches the worst wear and use conditions of most any component in the...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.